ElasticSearch查询max_result_window问题处理

需要出一份印地语文章的表，导出规则为：

　　1.所有印地语(包含各种颜色，各种状态)的文章

　　2.阅读数大于300

　　3.按照阅读推荐比进行排序，取前3000篇文章

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说明：

　　1.文章信息，和阅读推荐数量在两个Es中

　　2.印地语文章共30w+篇（不超过40w）

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思路：

　　从Topic-Es中每次获取500个文章uuid，再去UserLog-Es中查询这500个uuid的阅读推荐数，将阅读数大于300的文章信息放入List集合中，导出Excel。

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问题：

　　1.QueryPhaseExecutionException[Result window is too large, from + size must be less than or equal to: [10000] but was [10100]. 

    Failed to execute phase [dfs], all shards failed; shardFailures {[aPdAdh6fTlOzXsE7-rJ71Q][holga_index][0]: RemoteTransportException[[node-01][10.25.167.4:9300][indices:data/read/search[phase/dfs]]]; nested: QueryPhaseExecutionException[Result window is too large, from + size must be less than or equal to: [10000] but was [10100]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.]; }{[aPdAdh6fTlOzXsE7-rJ71Q][holga_index][1]: RemoteTransportException[[node-01][10.25.167.4:9300][indices:data/read/search[phase/dfs]]]; nested: QueryPhaseExecutionException[Result window is too large, from + size must be less than or equal to: [10000] but was [10100]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.]; }{[aPdAdh6fTlOzXsE7-rJ71Q][holga_index][2]: RemoteTransportException[[node-01][10.25.167.4:9300][indices:data/read/search[phase/dfs]]]; nested: QueryPhaseExecutionException[Result window is too large, from + size must be less than or equal to: [10000] but was [10100]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.]; }

　　多次测试这个问题是必现问题，只要使用from...size...查询的页码大于1w就会出现该错误。使用的程序代码为：

searchRequestBuilder.setQuery(query).addSort(SortBuilders.fieldSort("add_time").order(SortOrder.DESC)).setFrom(index).setSize(100);

　　解决这个问题需要使用到scroll，解决方案如下：

searchRequestBuilder.setQuery(query).addSort(SortBuilders.fieldSort("add_time").order(SortOrder.DESC)).setSize(500).setScroll(new TimeValue(total));

　　2.The supplied data appears to be in the Office 2007+ XML. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)

Exception in thread "main" org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:152)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:140)
    at org.apache.poi.poifs.filesystem.NPOIFSFileSystem.<init>(NPOIFSFileSystem.java:302)
    at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:87)
    at com.mkit.export.main.ExportExcel.write2File(ExportExcel.java:86)
    at com.mkit.export.main.ExportExcel.main(ExportExcel.java:35)

　　出现这个问题是因为，读取的Excel文件是xlsx(offic2007版本excel),但是却使用了HSSF(HSSF只支持office2003版本文件)去接收读取到的Workbook变量，所以会导致错误发生。

 FileInputStream fs=new FileInputStream("d://aa.xls");　　　　  //offic2003文件
 POIFSFileSystem ps=new POIFSFileSystem(fs);　　　　
 HSSFWorkbook wb = new HSSFWorkbook(ps);　　　　　　　　　　　　　//HSSFWorkbook(office 2003)       XSSFWorkbook(office 2007)
 HSSFSheet sheet = wb.getSheetAt(0);　　　　　　　　　　　　　　  //获取到工作表，因为一个excel可能有多个工作表
 int lastRowNum = sheet.getLastRowNum();
 System.out.println("获取最后一行为："+lastRowNum);